OUTDOOR AIRFLOW CONTROLLERS

The OAC-3000 modulates an MP-bus network actuator to maintain the outdoor airflow rate. The MP-bus solution is the most cost effective method for actuating small air valves and dampers on ducted systems to fan coils, makeup air to air handlers or zone level DOAS applications. DCV requires approved BACnet MS/TP CO2 sensors or occupancy counters.

Occupied mode is typically enabled by a 24 VAC output from a thermostat on fan coil systems or via BACnet MS/TP on makeup air to air handlers or zone level DOAS systems.

Contact closure relay can be assigned to notification alarms or active control mode

MS/TP BACnet connection

Overview

The OAC-3000 can be provided with a single integrated IAT-DI duct probe, one or two integrated IAT-UI or IAT-US universal mount probes or an approved external BACnet MS/TP airflow measurement device.

The OAC-3000 interfaces with approved MS/TP BACnet CO2 sensors and occupancy counters when DCV is required.

The OAC-3000 modulates a network MP-bus actuator to maintain the outdoor airflow rate when an external binary trigger is active (i.e. occupied mode). The binary trigger is typically is provided by a thermostat or other analog or MS/TP BACnet binary output. The trigger can also be provided by the 24 VAC control signal used when a two-position actuator is provided for outdoor air control (replace the two-position actuator with an MP-bus actuator).

Advanced logic and airflow measurement improves traditional CO2-DCV when demand control ventilation is required. The OAC-3000 controller resets the outdoor airflow setpoint between user defined minimum and maximum airflow limits to maintain either a user defined fixed CO2 level or variable airflow setpoint based on the population using a built-in CO2/airflow counting algorithm or external occupancy counter.

The OAC-3000 controller interfaces with most MS/TP BACnet building automation systems and supports full read/write privileges as a BACnet 1/8 load master. An RS-485 signal isolator is available when an isolated MS/TP network is required.